451. How is it that the second sight appears to be hereditary in certain families? “This is due to a similar physical makeup, which is transferred in the same manner as other physical qualities. It is also due to the development of the ability through training, which is passed down from one generation to another.”

KARDECPEDIA belongs to the IDEAK - Spiritist Divulgation Institute Allan Kardec. IDEAK is a non-profit
Spiritist Association created with the aim of spreading to the world Spiritism, according to the thinking
and works of Allan Kardec.